I'm not sure if this has been mentioned yet, but it's also important to note that not all Robux is equal. There's more information at https://en.help.roblox.com/hc/en-us/articles/115005718246 under section 3.B.
Also note that there is a comment in the video that you need to be careful how you spend your Robux for buying development, because if you are not then a cut gets taken, which maybe relates to 3B for the person you are paying?
Yes, ignoring any tax requirements because I'm not a tax attorney. You have to have 100k Robux (Rb) to initiate a withdrawl, that 100k Rb costs 1000 USD (ignoring any bulk deals they may run) to buy if you just purchased it from Roblox, but when you sell it to Roblox for USD you get 350 USD. So depending on how you look at it it is worth either 1k or 350 USD. The article was using 1k as the frame and it's what it would cost you to get that much buying directly so to me that's the most accurate.
Knowing nothing at all about Robux I’m not sure I follow. When you say “$1,000 worth of Robux” here you mean $1,000 USD, right? And not 1,000 units of Robux?
So if I’m a developer on the platform and I’ve earned however many Robux equal $1,000 USD and I initiate a transfer then my actual cash receipts will be ~$350 USD? Am I understanding that correctly? Because that seems nuts. Especially when they’re targeting kids as their primary “developers”.